It has to be someone who is responsible enough to make sure that they get the person who is "sick" directly to the nurse's office… and then come back.
I can't believe that I have to use this already, though! We're only in our 3rd week of school, and I've had about 7 or 8 absences because of illness.
As a teacher during the day, it is very difficult to decipher when (or if) to send down a student to the nurse. If you do, and there's nothing wrong, then you feel bad for sending down someone who might be taking advantage of the situation.
If you don't, and a throw-up occurs, THEN you've got trouble. It has happened to me a handful of times… and I tend to err on the side of caution.
If it looks at all like someone might have a problem, I trust my nurse escort to get them there and back. I would rather be "safe than sorry."
Another job that definitely is worth it.